Patterns
Decision design patterns organized by Operations, Trust, and Performance — production-ready blueprints for engineering teams.
Screening Insurance Eligibility by Age and Region with BLOCK Rules
Age, state, and coverage screens move out of scattered conditionals into BLOCK rules, so every decline carries its reason.
Deciding Subscription Proration with a Time-Travel Audit
Proration treatments move into versioned rules, so a disputed charge is proven against the policy in force that day.
Centralizing Plan-Tier Feature Entitlement with BLOCK Rules
Per-tier feature checks move out of scattered conditionals into BLOCK rules, so every denied feature carries its reason.
Adjudicating Credit Applications with a Priority-Ordered Mutex Group
A pattern that routes each credit application to one of approve, decline, or refer, and records which rule produced the decision.
Enforcing KYC-Tiered Transfer Limits with BLOCK Rules
Per-KYC-level transfer limits move out of scattered constants into BLOCK rules, so every blocked transfer carries its reason.
Testing a Rule Change Before Deploy with Impact Simulation
Measure a rule change's full impact against real historical orders before production, then decide on that evidence whether to ship.
Resolving VIP Tier Discount Stacking with a Mutex Group
A pattern that guarantees exactly one discount applies when tier discounts and seasonal campaigns collide.